void error(string $string) Write a string as error output.

string|array option(string $key = null) Get the value of a command option

string choice(string $question, array $choices, string $default = null, mixed $attempts = null, bool $multiple = null)

string askWithCompletion(string $question, array $choices, string $default = null)

void question(string $string, null|int|string $verbosity = null) Write

string askWithCompletion(string $question, array $choices, string $default = null)

ServiceProvider createProvider(string $provider)

int callSilent(string $command, array $arguments = array()) Call another

$this setRelation(string $relation, mixed $value) Set the specific relationship

bool hasOption(string $name) Determine if the given option is present.